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该系统的工作原理是:一种金属氢化物在较高温度下吸热后释放出氢气,氢气流在较低温度(环境温度)下被另一种金属氢化物吸收,再利用两种氢化物在环境温度下的氢压平衡反应,使后一种氢化物释氢,从而吸收室内的热量,达到空调降温的目的。 相似文献
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飞机座舱空气调节系统一般以极热天气情况下座舱的制冷能力和极冷天气下座舱的加热能力为考核点。通过分析在过渡季节工况下空调系统供气温度控制规律不满足制冷转制热模式快速调温需求原因的基础上,优化完善供气温度控制规律,提高了座舱空调系统环境舒适性。 相似文献
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本文综述了一些典型的金属氢化物体系的贮氢特性及其在汽车工程中的应用,介绍了几种氢化物贮氢机理的理论研究并讨论了氢汽车在未来汽车工业中的地位。文末附有文献40篇。 相似文献
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位于法国的电池主帅Saft与巴黎Est大学的同事们一起,在一个具有硫阴极和LiBH4电解质的完整的固体电池中首次使用纳米复合金属氢化物作为阳极。 相似文献
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当前清洁电池应该首推呼声较高的氢-镍电池。氢-镍电池起源于二十世纪60年代初,科学家发现,金属氢化物在常温下能大量吸收氢或释放氢。基于这个特性把金属氢化物作为负极材料,开发了氢-镍电池,也就是说氢镍-电池是在镉-镍电池的基础上把储氢材料代换了金属镉,人们认为氢-镍电池没有了金属镉就变成了清洁电池,是绿色电池。 相似文献
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热驱动弹热制冷是利用形状记忆合金被加热变形来驱动弹热材料相变从而产生制冷效应的新型固态制冷技术。本文设计了一种将弹热制冷装置与燃料电池相结合的组合系统,利用燃料电池产生的废热来驱动弹热制冷装置,以提高能量利用效率,并产生制冷效果。基于燃料电池和弹热制冷的工作原理,采用Simulink建立了全系统动态耦合仿真模型,研究了组合系统的动态工作特性,并分析了运行参数对系统性能的影响规律。结果表明:增加弹热制冷装置能提高整个系统的能量利用效率,电堆工作温度为80℃时该系统可产生1.76 kW的制冷功率,调整电堆工作压强至2.5 atm可最大化系统的综合输出功率和运行效率,电堆电流密度对组合系统的输出功率和运行效率呈现相反的影响趋势。 相似文献
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《JSAE Review》2002,23(3):303-308
Previous research by the authors showed that hydrogen combustion exhibits a higher cooling loss to the combustion chamber wall of an internal combustion engine compared to hydrocarbon combustion because of its higher burning velocity and shorter quenching distance. The high cooling loss means that reduction of the cooling loss is essential to establish a high thermal efficiency in hydrogen combustion engines. This research analyzed the applicability of equations to describe the heat transfer from burning gases to hydrogen combustion. The result shows that equations calculate a lower cooling loss than experimental values, and the use of correction coefficients does not accurately define the actual cooling rate. It is therefore concluded that the derivation of a new heat transfer equation for hydrogen combustion is necessary to improve the thermal efficiency of hydrogen fuelled engines. 相似文献
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The goal of this research is to investigate the application of low-cost climate control seats (CCSs) using a Heating, Ventilation and Air-conditioning system (HVAC). CCSs are being vigorously developed because demands on passengers’ thermal comfort are increasing recently. Nevertheless, current CCSs–thermo-electric devices (TED) that have been applied for both heating and cooling systems, have been used in limited luxury cars only. HVAC-type CCSs are proper for effective delivery of conditioned air due to thermal comfort and close proximity to passengers. In this study, experimental results show that HVAC-type CCSs have superior cooling performance and slightly worse heating performance than that of TED-type CCSs. In the case of HVAC-type CCSs, compared to TED-type CCSs, airflow volume was increased approximately 3.7–7.3 m3/h and surface temperature of seats was reduced by about 5 °C. And the maximum cool-down performance of HVAC-type CCSs was similar to the Base (Non HVAC-type CCSs). In addition, in passengers’ subjective evaluation, the HVAC-type CCSs, the former recorded twelve minutes to reach the comfort rate five both in cooling and heating test, meanwhile, TED-type CCSs are nineteen minutes and ten minutes each both in the cooling and heating test. 相似文献
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针对工程领域高热流密度传热问题实机试验复杂、数值仿真又难以确定准确边界的现状。设计了一种模拟试验台,在简单试件的两侧进行加热和冷却,形成高热流密度,在此基础上进行测试和控制。试件采用多种固定方式固定于试验支架,模拟实际力学约束条件。加热侧采用感应加热系统,冷却侧采用射流冲击冷却系统。数据采集和控制系统由NI硬件及其软件平台构建,应用cRIO嵌入式实时控制器及其相应的采集卡和输出卡,实现多种测量、记录和反馈报警。经试验验证,该试验台可以使试件达到1MW/m2的平均热流密度,可用于承受高热流密度热负荷作用的试件和材料的传热规律研究及其热疲劳可靠性研究。 相似文献
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为了更好地优化纯电动汽车动力电池系统的加热策略,以磷酸铁锂电池包为研究对象,测试其在3种不同环境温度下的电池降温性能,结合实际环境的影响,建立电池降温速率计算模型并通过测试验证。 相似文献
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